The Crveni Krst concentration camp, located in Crveni Krst, Niš, was operated by the German Gestapo and used to hold captured Serbs, Jews and Romanis during the Second World War. Established in mid-1941, it was used to detain as many as 35,000 people during the war and was liberated by the Yugoslav Partisans in 1944. More than 10,000 people are thought to have been killed at the camp. After the war, a memorial to the victims of the camp was erected on Mount Bubanj, where many inmates were shot. A memorial museum was opened on the former campgrounds in 1967 and in 1979 the campgrounds were declared a Cultural Monument of Exceptional Importance and came under the protection of the Socialist Republic of Serbia.